Hi,
I just ran these two microbenchmarks, where I attempted to measure the
overhead in Clojure's loop-recur form as compared to just mutating an
array.
;;loop-recur (5300 msecs)
(time
(dotimes [n 5000]
(loop [accum (int 0) i (int 0)]
(if (< i 50000)
(recur (+ accum i) (inc i))
accum))))
;;int-array (2910 msecs)
(time
(dotimes [n 5000]
(let [a (int-array 1)]
(dotimes [i 50000]
(aset a 0 (+ i (aget a 0)))))))
Because of these results, I think it's worthwhile to be able to access
a mutable location directly from within Clojure, such as a mutable
primitive.
Right now, I'm making do with a set of macros for creating and
manipulating 1 element arrays. But this incurs a cost of creating
those arrays when I really just want a mutable primitive.
What is everyone's opinion on this? Are mutable primitives still seen
as unnecessary? Or are they seen as necessary but not an immediate
concern?
-Patrick
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